检查下面这句话有没有语病： The results show the superhydrophobic superalloy surface have excellent self-cleaning property against carbon black.

The sentence is grammatically correct, but there is a minor issue with subject-verb agreement. "Have" should be replaced with "has" to agree with the singular subject "surface." The corrected sentence would be: "The results show the superhydrophobic superalloy surface has excellent self-cleaning property against carbon black."